Robert Mueller’s sprawling special-counsel investigation is playing hardball. It was not enough to get a search warrant to ransack the Virginia home of Paul Manafort, even as the former Trump campaign chairman was cooperating with congressional investigators. Mueller’s bad-asses persuaded a judge to give them permission to pick the door lock. That way, they could break into the premises in the wee hours, while Manafort and his wife were in bed sleeping. They proceeded to secure the premises — of a man they are reportedly investigating for tax and financial crimes, not gang murders and Mafia hits — by drawing...